Well, many US cities names are spanish, too. The Stones will have gigs at:
El Pueblo de Nuestra Señora la Reina de los Ángeles de la Porciúncula ("The Town of Our Lady Queen of the Angels of the Porciúncula"), a.k.a. LA
La Misión de San Francisco de Asís. a.k.a Frisco
La Misión de San Diego de Alcalá a.k.a San Diego
Las Vegas (The Meadows)
Fresno (Ash Tree)
So not all is due to King George
BTW, stoneslib is right about the naval bussiness back in 1588: wouldn't it be great having Southampton or Plymouth called San Fernando or Nueva Barcelona?
[There'll be no wedding today...]